Topological‐Distortion‐Driven Amorphous Spherical Metal‐Organic Frameworks for High‐Quality Single‐Mode Microlasers

Abstract

Metal‐organic frameworks (MOFs) have recently emerged as appealing platforms to construct microlasers owing to their compelling characters combining the excellent stability of inorganic materials and processable characters of organic materials. However, MOF microstructures developed thus far are generally composed of multiple edge boundaries due to their crystalline nature, which consequently raises significant scattering losses that are detrimental to lasing performance. In this work, we propose a strategy to overcome the above drawback by designing spherically shaped MOFs microcavities. Such spherical MOF microstructures are constructed by amorphizing MOFs with a topological distortion network through introducing flexible building blocks into the growth environment. With an ultra‐smooth surface and excellent circular boundaries, the acquired spherical microcavities possess a Q factor as high as ≈104 and can provide sufficient feedback for high‐quality single‐mode lasing oscillations. We hope that these results will pave an avenue for the construction of new types of flexible MOF‐based photonic components.

Integrating Unexpected High Charge‐Carrier Mobility and Low‐Threshold Lasing Action in an Organic Semiconductor

“…where λ and n g are the resonance wavelength and group refractive index, respectively. [12] Moreover, as shown in Figure S8c, Δλ exhibits a clear linear relationship with 1/L, which is in good agreement with WGM cavity and provides an opportunity to achieve single-mode laser due to its inherent merits including the excellent monochrome, and fine optical coherence. Importantly, based on a much smaller LD-2 single crystal, a single-mode lasing is successfully achieved with a main emission peak at 419 nm (FWHM: 0.385 nm; E th : 40.8 μJ cm À 2 ) in Figure 2g.…”

Hydrogen-Bonded Organic Framework Microlasers with Conformation-Induced Color-Tunable Output

“…Miniaturized lasers have attracted growing attention for their tremendous potential in fields from high-throughput chemical/biological sensing to photonic-integrated circuits. − The wavelength variability is of enormous importance for the applications of miniaturized lasers in more versatile and compact photonics devices. − Porous organic frameworks, derived from the organic system and porous framework, − not only inherit the tailorable excited-state processes but also permit the minimized quenching effect via decreasing the aggregation extent of gain molecules, − representing a promising tunable lasing system. − To date, various microlasers based on porous organic frameworks, including near-infrared tunable microlasers, switchable microlasers, and multicolor lasers, , have been demonstrated. Most of these microlasers are achieved from metal–organic frameworks via meticulously accommodating the laser dyes with the sacrifice of the pore space; − however, they often suffer from the obstacles of either relatively limited gain concentration or sophisticated fabrication techniques.…”

Enhanced catalytic activity of MOF-74 via providing additional open metal sites for cyanosilylation of aldehydes

“…Truncated hexagonal rods were observed in D17-MOF-74, while rice-shaped microparticles were observed in other D-MOF-74 samples. Typically, the rounded feature of the particle is representative of its amorphous characteristic 41 , 42 . In specific, the morphological change of MOF particles from the angled edges to the rounded edges was found to be related to the crystallinity change from the crystalline to the amorphous materials 42 .…”